for "good morning america," bianna golodryga, abc news, new york. >> thank you, bianna. >>> more, now. we have at buckingham palace, royal historian and author of "the queen: a life in brief," robert lacey. thank you for being with us. >> thank you, lara. >> let's talk about the timing of this royal heir. >> we thought we should be here a year ago. the tradition is, they knock them out quickly. the queen and diana had their first child within a year. we wondered why they were waiting. now, it's clear. they didn't want to upstage the queen's jubilee. there were things that kate had to do this year, like go on tour and take malaria tablets, which wouldn't have worked. and as we saw, they have a new home, that's going to be ready for them in london, in april. that's key to the timing. >> we're so happy for them. and i hope the timing is correct. and as we've seen on the show earlier, princess diana, clearly, has made a huge impact, not only on william, but on kate. >> indeed. and william, of course, brought kate back into the picture in this kay. and going to kensington palace, they're g